Right after giving them all their equipment, Zeke allowed the group to train using them within Heron's makeshift realm. There wasn't any problem because Zeke could simply supply more mana to the female [Dragon Morpher] but, the strain itself is not something which Heron could recover quickly from.
At most, all the group had was a day's worth of time within the realm. And this much is already a strain for Heron who already used the skill thrice within the same day. There were a lot of happy screams and shouts including laughs of excitement. Zeke somehow remembered the time when he gave Sebastian and Harun their weapons because of the scene. He removed the thought quickly because, he didn't want to remember the other things connected to their deaths.
Hence, with all of them getting familiar with their weapons, the realm dissolved.
